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Lagrangian and Eulerian views into a turbulent boundary layer flow using time-resolved tomographic PIV

Schröder, Andreas and Geisler, Reinhard and Wieneke, Bernd and Elsinga, G.E. and Scarano, Fulvio (2008) Lagrangian and Eulerian views into a turbulent boundary layer flow using time-resolved tomographic PIV. 14th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 2008-07-07 - 2008-07-10, Lisbon (Portugal).

Full text not available from this repository.

Abstract

The momentum exchange mechanisms in a turbulent boundary layer flow are of manifold temporal and spatial scales and governed by the organization of self-sustaining coherent flow structures driven by entrained high momentum fluid. Generic flow structures such as hairpin-like vortices and spanwise alternating wall bounded low- and high-speed streaks have been observed and extensively analyzed with both experimental and numerical methods, e.g. by means of PIV [1, 2] or DNS [3]. In many studies the role of these structures for the wall normal and spanwise fluid exchange has been highlighted mostly within an Eulerian reference frame. But for a full understanding of the momentum exchange in turbulent flows a step to a spatially resolved Lagrangian frame of reference would be advantageous. However, experiments measuring turbulent flows in a Lagrangian reference frame need techniques which allow following the trajectory of (single) particles in a high temporal resolution comparable to the smallest turbulence time scales and at the same experiment also for a long observation time in order to cover also the integral time scales. Up to now the Lagrangian turbulence characterization has been performed by statistical analysis over several spatially independent single particles measured by tracking methods [4, 5]. Using these techniques the achieved spatial resolution did not allow describing the coherent structures. One of the challenges of experimental turbulence research is therefore the combination of both viewpoints in a single experiment.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Lagrangian and Eulerian views into a turbulent boundary layer flow using time-resolved tomographic PIV
Authors:
AuthorsInstitution or Email of Authors
Schröder, AndreasUNSPECIFIED
Geisler, ReinhardUNSPECIFIED
Wieneke, BerndLaVision GmbH, Göttingen, Germany
Elsinga, G.E.Delft University of Technology, Department of Aerospace Engineering, Kluyverweg 1, 2629HS, Delft, The Netherlands
Scarano, FulvioDelft University of Technology, Department of Aerospace Engineering, Kluyverweg 1, 2629HS, Delft, The Netherlands
Date:2008
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings USB-Stick, Book of abstracts
Status:Published
Keywords:turbulent boundary layer, high-speed streaks, tomographic PIV, PIV
Event Title:14th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Event Location:Lisbon (Portugal)
Event Type:international Conference
Event Dates:2008-07-07 - 2008-07-10
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:29 Jul 2008
Last Modified:27 Apr 2009 14:41

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